JP2001130943A - Cement-based grout composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a cement-based grout composition containing a powdery cement dispersant by adding an reducing agent to a solution predominantly containing (A) a binder, (B) an aggregate, (C) an expansion accelerator and (D) a polycarboxylate polymer compound having a polyalkylene glycol chain, drying the resultant mixture and pulverizing the dried product. SOLUTION: The cement-based grout composition according to the present invention can maintain high packing ability and high separation resistance for a prolonged period of time, as compared with a conventional premixed cement-based grout composition. Therefore, even in the case in which the composition of the present invention is added to a complex structure in large amounts, no problem arises in execution.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grout composition used in the field of civil engineering and construction, and to a cement grout composition capable of supplying materials other than water in a ready-mixed state.

[0002]

2. Description of the Related Art In civil engineering and construction work, a fine gap in a concrete structure, a gap between the back of a tunnel and the ground, a gap in a reinforcing sleeve, a gap in a reverse-casting method, repair and reinforcement of a structure, Grouting work for filling mortar or cement paste under rock anchors and earth anchors, under bridge bases, under machine base plates, under track floors, and the like has been performed, and various grout materials have been developed (Japanese Patent Application Laid-Open No. 9-263438). And JP-A-10-95652).

In recent years, there has been a tendency for structures to be used with grout materials to be complicated, and the performance required for grout materials has become more sophisticated. It is required to adapt to new uses such as diagonal grout and steel joint grout.
In order to adapt to such a new use, it is required to maintain a higher filling property for a longer time than the conventional grout material and to have a higher strength. The balance between fluidity and viscosity is important to improve the filling properties.Even if the fluidity is sufficiently high, material separation occurs if the viscosity is low, or if the viscosity is too high, large resistance occurs during injection. And injection becomes difficult.

Conventionally, a cement dispersant has been used to improve fluidity, and a cement-based grout composition supplied in a ready-mixed form includes powder of a naphthalene sulfonate formalin condensate or melamine sulfonate formalin. Condensate powders are mainly used. However, these powdery cement dispersants have relatively low water-reducing and fluidity-retaining effects, making it difficult to reduce the water-cement ratio to obtain high strength. There was a problem that the property was reduced. Therefore, in order to maintain high filling properties for a long time, it was necessary to increase the amount of the powdery cement dispersant or setting retarder added or to increase the water-cement ratio. Increasing the amount of water or setting retarder or increasing the water-cement ratio leads to an increase in material separation and bleeding, lowering of filling properties, lowering of adhesion between the structure and the grout material, and further increasing strength. There is a problem that a decrease is caused, and particularly in the case of a quick-hardening type already-prepared grout material, there is a serious problem that the quick-hardening property is impaired. Further, in a cement dispersant containing a sulfonate-based formalin condensate as a main component, formalin is a harmful substance, so that it must be restricted in handling and use thereof.

In recent years, cement dispersants containing a polycarboxylic acid-based polymer compound having a high fluidity retaining effect as a main component have come to be used as a water reducing agent for concrete. However, this cement dispersant is manufactured as an aqueous solution. Therefore, it has not been possible to mix it in a previously prepared grout material in advance. For this reason, attempts have been made to powder a dispersant containing a polycarboxylic acid-based polymer compound as a main component, but a known powdering technique (Japanese Patent Publication No. 7-14829) has been proposed.
In order to obtain a powdery dispersant with high solubility in water, the insoluble gel is formed during the powder manufacturing process, and the resulting powder lacks stability in terms of properties such as dispersing action. It was easy. Also, a powdering method using a spray drying apparatus (Japanese Patent No. 2669761) is known, but since a large amount of inorganic powder must be used in combination, the content of the polycarboxylic acid-based polymer compound in the dispersant is reduced. There has been a problem that the dispersing performance is lowered, and the dispersing performance is lowered as compared with the case where the powder is used in an aqueous solution state. Therefore, compared to the conventional powdery cement dispersant, naphthalene sulfonate formalin condensate powder or melamine sulfonate formalin condensate, it is not possible to obtain a material that is more satisfactory in terms of performance and cost. Could not be applied.

Accordingly, an object of the present invention is to provide a cement-based grout composition having a high filling property-retaining effect and a high strength, which contains a powdery cement dispersant.

[0007]

The inventors of the present invention have made various studies and found that a reducing inorganic compound and a reducing organic compound were added to a solution containing a polycarboxylic acid polymer having a polyalkylene glycol chain. And dry powdered,
A powdery cement dispersant with excellent fluidity can be obtained efficiently, and if the powdery cement dispersant thus obtained is blended with a binder, an aggregate and an expansion enhancer, the effect of maintaining the filling property is high and the strength is high. It has been found that a cement grout composition of the present invention can be obtained, and the present invention has been completed.

That is, the present invention provides (A) a binder,
A reducing inorganic compound and a reducing organic compound are added to a liquid mainly containing (B) an aggregate, (C) an expansion enhancer, and (D) a polycarboxylic acid polymer having a polyalkylene glycol chain. The present invention further provides a cement grout composition having a powdery cement dispersant obtained by drying and powdering.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The powdery cement dispersant (D) to be added to the cement grout composition of the present invention contains a polycarboxylic acid polymer having a polyalkylene glycol chain as a main component as described above. It is obtained by adding a reducing inorganic compound and a reducing organic compound to a liquid, and drying and pulverizing the liquid. The polycarboxylic acid-based polymer compound having a polyalkylene glycol chain used here is not particularly limited. For example, (D ¹ ) a (meth) acrylic acid-based copolymer having a polyalkylene glycol chain and (D ² ) A maleic acid-based copolymer having a polyalkylene glycol chain (however, in the case of (D ² ), excluding a polyvalent metal salt) and the like, and these may be used alone or in combination of two or more. .

Of these, (D ¹ ) includes a group —CO
Preferred are OM (wherein M represents a hydrogen atom, an alkali metal, an alkaline earth metal, ammonium or an organic amine) and a (meth) acrylic acid-based copolymer having a polyalkylene glycol chain. As (D ² ), a polyalkylene glycol alkenyl ether-maleic anhydride copolymer (excluding polyvalent metal salts) and the like are preferred.

M in the group -COOM of the (D ¹ ) (meth) acrylic acid-based copolymer is a hydrogen atom; an alkali metal such as sodium or potassium; an alkaline earth metal such as calcium or magnesium; ammonium or an organic compound. Amines are preferred.

In the above (D ¹ ) and (D ² ), the polyalkylene glycol chain includes —O (CH ₂ CH)
Those represented by (R ^a ) O) _b — are preferred. Where ^Ra
Represents a hydrogen atom or a methyl group, and b is 2 to 200, preferably 5 to 109, particularly preferably 20 to 109, and more preferably 30 to 109.

Further, (D ¹ ) a preferable copolymer of (meth) acrylic acid-based copolymer comprises 40 to 80 mol% of a structural unit (1) represented by the following formula (1) in all the structural units:
The structural unit (2) represented by the following formula (2) is 2 to 25 mol%, and the structural unit (3) represented by the following formula (3) is 3 to 20 mol%.
Mole% and a number average molecular weight of 2,000 having a structural unit (4) represented by the following formula (4) at a ratio of 1 to 45 mole%.
50,000 (meth) acrylic acid copolymers.

[0014]

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[0015] ^{wherein, R 1, R 2, R} 4 and R ⁵ are the same or different and represent a hydrogen atom or a methyl group, R ³ and R ⁶ represents an alkyl group having 1 to 3 carbon atoms, M ¹ represents a hydrogen atom, an alkali metal, alkaline earth metal, ammonium or organic amine, X is -SO ₃ M ² or -O-
Ph-SO ₃ M ² (where M ² represents a hydrogen atom, an alkali metal, an alkaline earth metal, ammonium or an organic amine, and Ph represents a phenylene group);
Indicates an integer of 200)

In the above formulas (1) to (4), R ¹ , R ² , R ⁴
And R ⁵ are preferably a methyl group. R ³ and R ⁶
As a methyl group, an ethyl group, an n-propyl group, an i-
A propyl group is exemplified, and a methyl group is particularly preferred. Further, as M ¹ , sodium, potassium, calcium, magnesium, alkanolamine and the like are preferable,
Particularly, sodium is preferable from the viewpoint of solubility in water. Examples of M ² in the group X include alkali metal atoms such as sodium and potassium, alkaline earth metals such as calcium and magnesium, and organic amines such as alkanolamines such as ammonium and ethanolamine. As Among these X, -SO ₃ Na are preferred. In the formula (4), n is 2 to 200,
109 is preferred, especially 20 to 109, more preferably 30 to 1
09 is preferred. The content of the structural unit (1) is preferably from 40 to 80 mol%, and particularly preferably from 45 to 75 mol%. The content of the structural unit (2) is preferably 2 to 25 mol%, and particularly preferably 5 to 20 mol%. The content of the structural unit (3) is preferably from 3 to 20 mol%, particularly preferably from 5 to 15 mol%. Further, the content of the structural unit (4) is preferably from 1 to 45 mol%, particularly preferably from 3 to 40 mol%. In addition, mol% of a structural unit shows mol% of each structural unit when all the structural units of (1)-(4) are 100 mol%.

In particular, a preferable (D ¹ ) (meth) acrylic acid-based copolymer is such that the structural unit (5) represented by the following formula (5) is 40 to 70 mol% in all the structural units. A structural unit (6) represented by the following formula (6) is
Mol%, the structural unit (7) represented by the following formula (7) is 1 to
Number average molecular weight having 20 mol%, 1 to 30 mol% of the structural unit (8) represented by the following formula (8), and 1 to 30 mol% of the structural unit (9) represented by the following formula (9). 2
000 to 50,000 (meth) acrylic acid-based copolymers.

[0018]

Embedded image

Wherein R ⁷ , R ⁸ , R ¹⁰ , R ¹¹ , R ¹³ and R ¹⁴ are the same or different and each represent a hydrogen atom or a methyl group, and R ⁹ , R ¹² and R ^{15 each} have 1 to 1 carbon atoms. 3 represents an alkyl group; M ³ represents a hydrogen atom, an alkali metal, an alkaline earth metal, ammonium or an organic amine;
SO ₃ M ⁴ or —O—Ph—SO ₃ M ⁴ (where M ⁴ represents a hydrogen atom, an alkali metal, an alkaline earth metal, ammonium or an organic amine, and Ph represents a phenylene group), and m Represents an integer of 2 to 200, and p represents 2 to 1
09 represents an integer. ]

In the above formulas (5) to (9), R ⁷ , R ⁸ ,
R ¹⁰ , R ¹¹ , R ¹³ and R ¹⁴ are preferably a methyl group. Examples of R ⁹ , R ¹² and R ¹⁵ include a methyl group, an ethyl group, an n-propyl group, and an i-propyl group, with a methyl group being preferred. As M3 and M4, sodium, potassium, calcium, magnesium, alkanolamine and the like are preferable, and sodium is particularly preferable. As the group Y, -SO3Na is preferable. (8) In the formula, m is 2 to 200,
Is preferred, and particularly preferably 20 to 109, and more preferably 30 to 109.
To 109 are preferable. Further, p in the expression (9) is 2 to 10.
9, but preferably 5 to 50. Structural unit (5) is 4
It is preferably from 0 to 70 mol%, particularly from 45 to 65 mol%.
Preferably it is mol%. Structural unit (6) is 5 to 3
It is preferably 0 mol%, particularly preferably 8 to 23 mol%. Structural unit (7) is 1 to 20 mol%
It is particularly preferable that the content is 1 to 15 mol%. The content of the structural unit (8) is preferably from 1 to 30 mol%, particularly preferably from 5 to 25 mol%. Further, the content of the structural unit (9) is preferably 1 to 30 mol%, and particularly preferably 3 to 25 mol%. In addition, mol% of a structural unit shows mol% of each structural unit when the total of all the structural units of (5)-(9) is 100 mol%.

The (meth) acrylic acid-based copolymer comprising the above structural units includes a number average molecular weight of 2,000 to 5,000.
0 (GPC method, polyethylene glycol equivalent) is preferable, and 3500 to 30,000 is more preferable.

On the other hand, maleic acid-based copolymers having (D ² ) alkylene glycol chains include methyl polyethylene glycol vinyl ether-maleic anhydride copolymer, polyethylene glycol allyl ether-maleic anhydride copolymer, methyl polyethylene glycol Allyl ether-maleic anhydride copolymer, methyl methacrylate polyethylene glycol-maleic acid copolymer and the like can be mentioned. The preferred number average molecular weight (GPC method, calculated as polyethylene glycol) of the copolymer (D ² ) is 30.
It is preferably from 2000 to 200,000, particularly preferably from 3000 to 80000.

Examples of the reducing inorganic compound include sulfite, nitrite, thiosulfate and the like. As these salts, alkali metal salts and alkaline earth metal salts are preferable. Although it is not clear why the addition of the reducing inorganic compound can prevent gelation during kneading and stirring in the drying step, the radical reaction in which the reducing inorganic compound remains in the polycarboxylic acid-based copolymer-containing liquid is initiated. It is considered to deactivate the agent. Therefore, the amount of the reducing inorganic compound to be added may be determined according to the type and amount of the radical reaction initiator remaining in the mixture, and usually, the solid content of the radical reaction initiator used in the synthesis of the polymer compound is determined. (Mol% value) or less, but the amount (mol% value) of the solid content of the remaining radical reaction initiator
It is desirable that the amount is not less than the amount capable of deactivating the oxidizing power of the residual radical reaction initiator.

The reducing organic compound is preferably an amine compound, especially an alkanolamine. Specifically, triethanolamine, diethanolamine, monoethanolamine, isopropanolamine, N, N
Alkanolamines such as diethylethanolamine,
Examples thereof include alkylamines such as sec-butylamine, and diamines such as ethylenediamine. By the addition of the reducing organic compound, the load on the kneading stirrer is greatly reduced, and the COD value of the distilled water discharged at the time of dry powder is reduced (200 mg / L or less).

The amount of each of the reducing inorganic compound and the reducing organic compound is 0.01 to 2.5% by weight, particularly 0.5 to 1% by weight, based on the solid content of the polycarboxylic acid-based polymer compound. 0.5% by weight is preferred. The addition of such a reducing organic compound reduces the load on the mixing stirrer in the drying and pulverization step, and also lowers the COD value of water distilled off during drying, because it is used as a crushing aid. It is presumed that the polymerization reaction proceeds at a low temperature near room temperature due to the amine effect while the unreacted monomer is consumed.

The powdery cement dispersant (D) used in the present invention can improve its hygroscopicity and blocking properties,
After drying to reduce measurement errors, in addition to the above essential components, a polyalkylene glycol, and a carbon number of 8 to 22
Or a salt thereof, or an inorganic powder.

Preferred examples of the polyalkylene glycol include polyethylene glycol having a molecular weight of 1,000 to 20,000, and polypropylene glycol having a molecular weight of 2,000 to 6,000. Among them, polyethylene glycol is particularly preferable, and further, the average molecular weight is 2,000.
Polyethylene glycol of ~ 4000 is preferred.

The fatty acid having 8 to 22 carbon atoms or a salt thereof may be saturated or unsaturated, and may be linear or branched. Specifically, caprylic acid, pelargonic acid, capric acid, undecylic acid, lauric acid,
Tridecylic acid, myristic acid, pentadecylic acid, palmitic acid, heptadecylic acid, stearic acid, nonadecanoic acid, arachiic acid, behenic acid, undecylenic acid, oleic acid, elaidic acid, setreic acid, erucic acid, brassic acid and salts thereof Can be As the salts of the above fatty acids, metal salts such as sodium, potassium, barium, calcium, zinc, aluminum and magnesium are preferable. In particular, stearic acid or a salt thereof is preferred,
Particularly preferred is calcium stearate. The compounding amount of these polyalkylene glycols and fatty acids having 8 to 22 carbon atoms or salts thereof is 0.2 to 30% by weight based on the solid content of the polycarboxylic acid polymer having a polyalkylene glycol chain, Particularly, 0.5 to 20% by weight is preferable.

As the inorganic powder, powders of inorganic salts such as calcium carbonate and calcium silicate, clay mineral powders such as kaolinite and bentonite, and fine powders such as blast furnace slag and fly ash can be used. Such an inorganic powder, with respect to the solid content of the polycarboxylic acid polymer compound,
You may use up to about three times.

The liquid containing the polycarboxylic acid polymer as a main component may contain a solution or dispersion of water or an organic solvent.

Since the polycarboxylic acid polymer-containing liquid is usually an acidic liquid, sodium hydroxide, potassium hydroxide and calcium hydroxide are added after adding a reducing inorganic compound and a reducing organic compound. PH 7 to 9 by adding an aqueous solution of an alkali metal or alkaline earth metal such as
It is preferred to adjust to. If the pH is not adjusted, the polymer compound in the mixture is liable to undergo hydrolysis during the heating and drying treatment, and the COD value of water distilled off during drying increases. When the polycarboxylic acid-based polymer compound-containing solution has a pH of 7 to 9 from the beginning, it is not necessary to adjust the pH by adding a pH adjuster.

The drying is not particularly limited as long as it is a convection type drying apparatus such as a hot air type or a heat conduction type drying apparatus. Flash jet dryers are suitable. When the processed product is a high-concentration solution exceeding 40% or a material having high viscoelasticity, it is preferable to use a drying machine such as a kneading stirring dryer or a band-type continuous vacuum dryer. However, since the polycarboxylic acid-based polymer compound having a polyalkylene glycol chain may become viscous during the concentration process, from the viewpoint of powdering efficiency and the like, it is particularly preferable to carry out kneading and stirring to dry powder. . Kneading
The stirring temperature is preferably about 40 to 120 ° C, more preferably about 60 to 110 ° C. The kneading / stirring can be carried out in the air, but it is desirable to carry out the kneading in a reduced pressure or an inert gas atmosphere such as nitrogen or argon from the viewpoint of preventing deterioration. Further, it is preferable that after concentrating until the hardness becomes 30 ° or more, it is dried and pulverized while kneading and stirring with a horsepower of 0.5 kg / m ³ / rpm or more. By performing such a drying operation, a powdery dispersant can be obtained. The dried powder may be agglomerated into small agglomerates, but the agglomerates are fragile and can be easily formed into single particles with a slight crushing force.

(D) The powdered dispersant has an average particle diameter of 5 to 2,000 by an arbitrary pulverizing / classifying method for convenience in use.
It is desirable to adjust the thickness to μm, more preferably 10 to 500 μm. However, since the produced powdery dispersant (D) is relatively weak to heat, a pulverizer having low heat storage property is preferable, and specifically, a pin-type mill is preferable. There is also a pulverizer integrated with a screen for adjusting the particle size. However, since the heat of pulverization increases when unpulverized material stays, it is preferable to perform pulverization and classification separately.

If the amount of the powdery cement dispersant (D) thus obtained added to the grout composition of the present invention is too small, there is no effect, and if it is too large, it causes setting retardation and strength reduction. 0.005 to 5 parts by weight, particularly 0.01 to 3 parts by weight, is preferred.

As the binder (A) used in the present invention, cement other than quick-hardening cement, for example, Portland cement (ordinary cement, early-strength cement, ultra-high-strength cement, moderate heat cement, sulfate-resistant cement, etc.), Blend cement (blast furnace cement, fly ash cement, silica cement, etc.) and the like can be mentioned.

As the aggregate (B) used in the present invention, river sand,
Sea sand, land sand, crushed sand, silica sand and the like can be used, and these sands are preferably dry sands. Also, fly ash, blast furnace slag,
Calcium carbonate, silica fume and the like can be used in combination with the above sand. When supplied as a pre-mixed grout mortar composition, it is preferable that the aggregate to be blended has a particle size of 5 mm or less and an FM of about 1.5 to 3.0. If the amount of the aggregate in the case of the grout mortar composition is too small, the amount of shrinkage increases, and if the amount is too large, the strength and fluidity decrease.
0 parts by weight is preferable, and 60 to 150 parts by weight is particularly preferable.

The expansion-enhancing material (C) used in the present invention is used for the purpose of ensuring the adhesion between the structure and the grout material, and therefore has the effect of reducing shrinkage and exhibits an expansion effect by a hydration reaction. For example, as a calcium sulfoaluminate-based inorganic substance, aauin, a calcium aluminate-based inorganic substance, amorphous or crystalline various aluminates, a lime-based inorganic substance, calcium oxide, a metal-based metal aluminum powder or Iron powder and the like. The amount of the expansion enhancer is, for example, when a lime-based expansion enhancer is used, based on 100 parts by weight of the binder,
0.5 to 20 parts by weight, especially 1 to 10 parts by weight is preferred.
When metal aluminum powder is used, 0.0002 to 0.01 parts by weight with respect to 100 parts by weight of the binder,
Particularly, 0.0006 to 0.008 parts by weight is preferable. Here, it is more preferable to use the metal aluminum powder in combination with the calcium sulfaluminate-based inorganic substance, the calcium aluminate-based inorganic substance, or the lime-based inorganic substance, because the effect of reducing shrinkage is maintained for a long period from the early age of the material.

The cement grout composition of the present invention includes:
Further, (E) a thickener may be blended.

The thickener (E) used in the present invention is used for the purpose of preventing material separation, so long as it has a function of imparting viscosity, for example, methyl cellulose and polyvinyl alcohol. (E) The compounding amount of the thickener is 0.001 to 0.2 per 100 parts by weight of the binder.
Part by weight, especially 0.002 to 0.05 part by weight is preferred.

The cement grout composition of the present invention may contain a shrinkage reducing agent and the like, if necessary, in addition to the above-mentioned materials. In addition, an extender and various admixtures can be used as long as they do not adversely affect the physical properties.

The cement grout composition of the present invention is usually prepared by blending the above-mentioned materials, usually in the form of a bag, etc., kneading with water using a mixer at a construction site, and then casting. The mixer used here is not particularly limited, and the amount of water to be added is usually 30 to 100 parts by weight based on 100 parts by weight of the binder.

[0042]

EXAMPLES Hereinafter, the present invention will be described in more detail by way of examples, but the present invention is not limited thereto. The materials used in the examples are as follows.

[Materials Used] (1) Binder Fast Portland Cement (manufactured by Taiheiyo Cement Co., Ltd.) (2) Fine aggregate limestone crushed sand M = 2.5 (3) Powdery cement dispersant The powdery cement dispersant according to the present invention The polycarboxylic acid polymer compound used in the production of the powdery cement dispersant used in the present invention is shown below.

[0044]

[Table 1]

[0045]

[Table 2]

[Production Method of Powdered Cement Dispersant According to the Present Invention] To each of 800 g of a liquid mixture having a solid content of 45% and containing the high molecular compounds shown in Tables 1 and 2 as a main component,
10% by weight aqueous sodium hydroxide solution 7 for pH adjustment
5.2 g was added, and the mixture was stirred at room temperature for about 3 minutes. Next, sodium sulfite and triethanolamine as a reducing agent are added in an amount of 0.5 to 2% by weight based on the solid content, and the mixture is stirred for 3 minutes. The mixture was concentrated and dried while kneading under a reduced pressure of 30 torr. The obtained powder is pulverized with a pulverizer (MCG180 manufactured by Matsubara Co., Ltd.) to obtain a particle size of 50 to 500.
μm, powdered cement dispersants (1) and (2) shown in Table 3 were obtained.

[0047]

[Table 3]

Conventional powdery cement dispersant Melment F10 (a melamine sulfonate formalin condensate manufactured by SKW East Asia Co., Ltd.) (4) Thickener Metroze (a cellulose-based thickener manufactured by Shin-Etsu Chemical Co., Ltd.) (5) ) Expansion enhancer Calcium oxide based expander (Expan manufactured by Taiheiyo Cement Co., Ltd.) Metal aluminum powder (purity 99% or more, fineness 180 mesh or more, JIS K 5906 (aluminum powder for coating) 2nd class, 88 μm residue 2) %Less than)

Table 4 shows a formulation example of the cement grout composition of the present invention.

[0050]

[Table 4]

The performance test of the cement grout composition of the present invention was performed as follows. [Test Example] 18 parts by weight of water was added to 100 parts by weight of a material prepared according to the composition shown in Table 4, and the mixture was mixed for 3 minutes using a Hobart mixer. As the evaluation of the value and the viscosity, the consistency (flow time in the J funnel) was measured every 15 minutes from immediately after kneading to 75 minutes. The bleeding rate was measured as an evaluation of material separation. Further, the expansion rate up to 24 hours after kneading and the compressive strength at 28 days of age were measured. The test results are shown in Tables 5 to 8.

[Flow value measuring method] JIS R 520
1 Measured according to “Physical test method of cement”. [Measurement method of J funnel falling time] Measured according to the Japan Society of Civil Engineers standard “PC grout test method (JSCE-F531)”. The J funnel used had an inner diameter of the outlet of 14 mm. [Expansion coefficient measurement method] The expansion rate was measured up to 24 hours in accordance with the Japan Society of Civil Engineers standard “PC grout test method (container method) (JSCE-F533)”. [Measuring method of bleeding rate] Japan Society of Civil Engineers “PC grout test method (polyethylene bag method) (JSCE-F
532) ". [Method of Measuring Compressive Strength] The compressive strength was measured at a material age of 28 days according to JIS R 5201 “Physical test method of cement”.

[0053]

[Table 5]

[0054]

[Table 6]

[0055]

[Table 7]

[0056]

[Table 8]

As shown in Tables 5 to 8, the cement grout composition of the present invention can maintain high filling properties and separation resistance for a long time as compared with those using a conventional powdery cement dispersant, and bleeding. It can be seen that they also have excellent quality in terms of modulus, expansion coefficient and compressive strength.

[0058]

As described above, the cement grout composition of the present invention comprises:
Compared to previously used cement-based grout compositions that have been used in the past, high filling properties and separation resistance can be maintained for a long time, and construction can be performed without problems even when a large amount is injected into a complex structure. it can.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C04B 24:26 C04B 24:26 F 24:12 24:12 A 22:14 22:14 Z 24:26 24 : 26 A)) E 111: 70 111: 70 (72) Inventor Hirotaka Isomura 2-4-2 Daisaku, Sakura-shi, Chiba Pref. Inside the Sakura Research Institute, Pacific Cement Co., Ltd. (72) Inventor Koichi Soeda Daisaku-ji, Sakura-shi, Chiba Chome 4-2 Taiheiyo Cement Co., Ltd. Sakura Laboratory

Claims (2)

[Claims] 1. A liquid containing (A) a binder, (B) an aggregate, (C) an expansion enhancer, and (D) a polycarboxylic acid-based polymer compound having a polyalkylene glycol chain as a main component. A cement grout composition containing a powdery cement dispersant obtained by adding a reactive inorganic compound and a reducing organic compound, followed by drying and pulverization. 2. The cement grout composition according to claim 1, further comprising (E) a thickener.